Crossword Genius

A leftover admirer? (5)

Ross

I believe the answer is:

lover

I'm a little stuck... Click here to teach me more about this clue!

'admirer?' is the definition.
(admirer is a kind of lover)

'a leftover' is the wordplay.
I cannot quite understand how this works, but
'leftover' could be 'lo' (abbreviations for left and over) and 'lo' is present in the answer.
The remaining letters 'ver' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for lover that I've seen before include "One enjoys" , "toy boy" , "Lothario" , "Romeo (or Juliet)" , "Boyfriend" .)

I've seen this clue in the Evening Standard.
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